Porous pavers near existing trees

This
parking lot for a large botanical garden was constructed near some existing
large trees. Porous pavers were used to help preserve the root system
and soil structure.

Be sure that the soil grade is not lowered during
the construction process because this will damage roots. Soil can be
added around the roots to prepare a base for the pavers, but be sure
it is coarser than the existing soil. A coarse sand would work nicely
because it compacts yet allows for enough air space between particles
for air movement.